<div dir="ltr">Andrea,<div><br></div><div>Are your mesh cells linear (and hence linear interpolation would be used)? If so, then the minimum will always be at a mesh point. If they are higher order elements, then indeed the minimum could be somewhere inside a cell. Others on the list may be able to tell you if there is a way to find this minimum point in VTK.</div><div><br></div><div>Best regards,</div><div>Cory</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, May 3, 2018 at 4:13 AM Caffagni, Andrea <<a href="mailto:Andrea.Caffagni@ferrari.com">Andrea.Caffagni@ferrari.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thank you Mathieu for your suggestion,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">But if I understand correctly with this method I’m able to find only the value on the mesh points.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thus, if I change the mesh with finer or coarser elements the value and the location that I can find change.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I would like to avoid this behavior, for this reason I would get the minimum value using the interpolated value on the slice.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">do you think it's possible to do it? can I manage this with a programmable filter (work from script without gui)?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Andrea<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Mathieu Westphal [mailto:<a href="mailto:mathieu.westphal@kitware.com" target="_blank">mathieu.westphal@kitware.com</a>]
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<b>Sent:</b> Thursday, May 03, 2018 09:07<br>
<b>To:</b> Caffagni, Andrea<br>
<b>Cc:</b> <a href="mailto:paraview@public.kitware.com" target="_blank">paraview@public.kitware.com</a><br>
<b>Subject:</b> Re: [Paraview] find minimum on a slice using interpolated values<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Andrea,<u></u><u></u></p>
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<p class="MsoNormal">If your are using ParaView, you can obtain this information quite easilly by showing your dataset in a Spreadsheet view and orderinng the data by "Pressure".<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Best,<u></u><u></u></p>
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<p class="MsoNormal"><br clear="all">
<u></u><u></u></p>
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<p class="MsoNormal">Mathieu Westphal<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Wed, May 2, 2018 at 8:57 PM, Caffagni, Andrea <<a href="mailto:Andrea.Caffagni@ferrari.com" target="_blank">Andrea.Caffagni@ferrari.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span lang="IT" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear users,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I need to find the absolute minimum value on a slice of a certain scalar (like pressure).</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I would get this point using the interpolation in order to avoid the ‘sensitivity’ to the mesh (in
this way, theoretically, if I change the mesh the minimum should always remain at the same point).</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">For this point I would like to get the three-dimensional position and the value of the scalar in
question (pressure and/or velocity), maybe I can use the numpy functions in a programmable filter?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.amin.html" target="_blank">https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.amin.html</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">But I have not idea of how use the interpolation…</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks for the suggestions,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Andrea</span><u></u><u></u></p>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Cory Quammen<br>Staff R&D Engineer<br>Kitware, Inc.</div>